APA Edition Citation

Gamma, E. . . .., Helm, R. . .., & Johnson, R. . .. (1995). Design patterns elements of reusable object-oriented software. Pearson Education.

Chicago Edition Citation

Gamma, Erich ., Richard Helm, and Ralph Johnson. Design Patterns Elements of Reusable Object-oriented Software. New Delhi: Pearson Education, 1995.

MLA Edition Citation

Gamma, Erich ., et al. Design Patterns Elements of Reusable Object-oriented Software. Pearson Education, 1995.